無関係なパッケージnautilus-dropboxをインストールするためのビルドの前提条件

ソフトウェアセンターからインストールしようとするたびに、数時間は0％のままになります。代わりに、ソースからコンパイルして必要なアプリケーションをインストールしようとしています。パッケージが必要build-essentialなので試してみましたapt-get。これで複数の依存関係もインストールしようとしましたが、dropbox-nautilus数時間100％のダウンロード状態で停止します。完全な端末出力は次のとおりです。

sudo apt-get install build-essential
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libunistring0:i386 libgomp1:i386 libcroco3:i386 libgettextpo0:i386
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  dpkg-dev fakeroot libalgorithm-diff-perl libalgorithm-diff-xs-perl
  libalgorithm-merge-perl libdpkg-perl
Suggested packages:
  debian-keyring
The following NEW packages will be installed:
  build-essential dpkg-dev fakeroot libalgorithm-diff-perl
  libalgorithm-diff-xs-perl libalgorithm-merge-perl libdpkg-perl
0 upgraded, 7 newly installed, 0 to remove and 327 not upgraded.
6 not fully installed or removed.
Need to get 818 kB of archives.
After this operation, 3,169 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://ca.archive.ubuntu.com/ubuntu/ precise-updates/main libdpkg-perl all 1.16.1.2ubuntu7.6 [181 kB]
Get:2 http://ca.archive.ubuntu.com/ubuntu/ precise-updates/main dpkg-dev all 1.16.1.2ubuntu7.6 [468 kB]
Get:3 http://ca.archive.ubuntu.com/ubuntu/ precise-updates/main build-essential amd64 11.5ubuntu2.1 [5,816 B]
Get:4 http://ca.archive.ubuntu.com/ubuntu/ precise/main fakeroot amd64 1.18.2-1 [87.2 kB]
Get:5 http://ca.archive.ubuntu.com/ubuntu/ precise/main libalgorithm-diff-perl all 1.19.02-2 [50.7 kB]
Get:6 http://ca.archive.ubuntu.com/ubuntu/ precise/main libalgorithm-diff-xs-perl amd64 0.04-2build2 [12.4 kB]
Get:7 http://ca.archive.ubuntu.com/ubuntu/ precise/main libalgorithm-merge-perl all 0.08-2 [12.7 kB]
Fetched 818 kB in 5s (136 kB/s)                 
Selecting previously unselected package libdpkg-perl.
(Reading database ... 234719 files and directories currently installed.)
Unpacking libdpkg-perl (from .../libdpkg-perl_1.16.1.2ubuntu7.6_all.deb) ...
Selecting previously unselected package dpkg-dev.
Unpacking dpkg-dev (from .../dpkg-dev_1.16.1.2ubuntu7.6_all.deb) ...
Selecting previously unselected package build-essential.
Unpacking build-essential (from .../build-essential_11.5ubuntu2.1_amd64.deb) ...
Selecting previously unselected package fakeroot.
Unpacking fakeroot (from .../fakeroot_1.18.2-1_amd64.deb) ...
Selecting previously unselected package libalgorithm-diff-perl.
Unpacking libalgorithm-diff-perl (from .../libalgorithm-diff-perl_1.19.02-2_all.deb) ...
Selecting previously unselected package libalgorithm-diff-xs-perl.
Unpacking libalgorithm-diff-xs-perl (from .../libalgorithm-diff-xs-perl_0.04-2build2_amd64.deb) ...
Selecting previously unselected package libalgorithm-merge-perl.
Unpacking libalgorithm-merge-perl (from .../libalgorithm-merge-perl_0.08-2_all.deb) ...
Processing triggers for man-db ...
Setting up gdebi-core (0.8.5build1) ...
Setting up libcairo-perl (1.081-1build2) ...
Setting up libglib-perl (2:1.241-1) ...
Setting up libpango-perl (1.222-1build1) ...
Setting up libgtk2-perl (2:1.223-1build3) ...
Setting up nautilus-dropbox (0.7.1-2) ...

Dropbox is the easiest way to share and store your files online. Want to learn more? Head to http://www.dropbox.com/

Downloading Dropbox... 100%

ここで何が起こっているのでしょうか？どうすれば解決できますか？apt-get現在はまったく使用できません。